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Financial Income and Expenses - Summary of Financial Income and Expenses (Parenthetical) (Detail) - SEK (kr) kr in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Detailed Information About Finance Income Expense [Abstract] |  |  |
Net gain from revaluation of customer finance receivables | kr 6 |  |
Net loss from revaluation of customer finance receivables |  | kr 209 | kr 15
Net loss on revaluation of investments in shares and participations | kr 202 | kr 186 | kr 205

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